This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -324 |
| 3 | -10976 |
| 4 | -260898 |
| 5 | -4919184 |
| 6 | -67536616 |
| 7 | -212659776 |
| 8 | 28757879829 |
| 9 | 1419855850728 |
| 10 | 48139832128404 |
| 11 | 1387340166285216 |
| 12 | 36039677403855158 |
| 13 | 861269016060967824 |
| 14 | 18976682736434056968 |
| 15 | 379832429643337648960 |
| 16 | 6586595998856413482930 |
| 17 | 83878202724395340243384 |
| 18 | 7117837083803882256428 |